C20 advertisement which was rejected from appearing at Brisbane Airport.

On Monday, Fairfax Media reported that a billboard asking for world leaders to put climate change on the G20 agenda was vetoed by the BAC.

A second large billboard from anti-corruption agency Transparency International and eight smaller advertisements from the G20's official citizen response group, the C20 – have now been vetoed by BAC.

However Brisbane Airport Corporation on Tuesday afternoon insisted both billboards and the eight smaller posters were all rejected two weeks ago on October 21 and the "news" was being drip-fed to media outets by the protesters.

The C20 is the formal platform for dialogue between the political leaders of G20 countries and representatives of civil society organisations.

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The C20 wanted to display eight advertisements on poverty and inequality on light boxes near the baggage carousels at Brisbane's International Airport.

A BAC spokeswoman confirmed the billboard from Transparency International was also banned last week for being "too political".

"I understand it was (focused on) money laundering and again it was the political intent was the reason why it was rejected," she said.

"And not the content or the message."

The billboard's proposed wording for Transparency International's billboard said "Dirty money not welcome here. G20 it's time to unmaskthecorrupt.com".

BAC's media policy prohibits the use of billboards and advertisements being placed which encourages a "political action" from its readers.

It is directed towards banning political advertisements being placed at the airport, which could be seen by a large number of passengers.

The BAC spokeswoman had no knowledge of the advertisement from C20.

However, The C20 - a civil society forum that engages with the G20 - confirmed their ads were vetoed by BAC's outdoor media group Ooh! Media last week as being "too political".

The group wanted to raise issues including tackling poverty and improving infrastructure.

"We can talk to leaders as an official engagement group, but it seems we can't talk to the public," C20 spokesman John Lindsay told reporters.

Mr Lindsay said they had designed eight separate lightboxes which they planned to display near the baggage carousel at Brisbane's International Airport.

"They are eight different images which were to be displayed on the light boxes on top of the baggage carousels," he said.

"We submited our artwork thinking everything was fine and then, they were rejected by the airport as being 'too political'."

Mr Lindsay said the ads were not "party political", but dealth with global issues like poverty, inequality."